acpi_status
acpi_rs_get_list_length (
u8 *byte_stream_buffer,
u32 byte_stream_buffer_length,
acpi_size *size_needed)
{
u32 buffer_size = 0;
u32 bytes_parsed = 0;
u8 number_of_interrupts = 0;
u8 number_of_channels = 0;
u8 resource_type;
u32 structure_size;
u32 bytes_consumed;
u8 *buffer;
u8 temp8;
u16 temp16;
u8 index;
u8 additional_bytes;
ACPI_FUNCTION_TRACE ("rs_get_list_length");
while (bytes_parsed < byte_stream_buffer_length) {
/* The next byte in the stream is the resource type */
resource_type = acpi_rs_get_resource_type (*byte_stream_buffer);
switch (resource_type) {
case ACPI_RDESC_TYPE_MEMORY_24:
/*
* 24-Bit Memory Resource
*/
bytes_consumed = 12;
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_mem24);
break;
case ACPI_RDESC_TYPE_LARGE_VENDOR:
/*
* Vendor Defined Resource
*/
buffer = byte_stream_buffer;
++buffer;
ACPI_MOVE_16_TO_16 (&temp16, buffer);
bytes_consumed = temp16 + 3;
/* Ensure a 32-bit boundary for the structure */
temp16 = (u16) ACPI_ROUND_UP_to_32_bITS (temp16);
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_vendor) +
(temp16 * sizeof (u8));
break;
case ACPI_RDESC_TYPE_MEMORY_32:
/*
* 32-Bit Memory Range Resource
*/
bytes_consumed = 20;
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_mem32);
break;
case ACPI_RDESC_TYPE_FIXED_MEMORY_32:
/*
* 32-Bit Fixed Memory Resource
*/
bytes_consumed = 12;
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_fixed_mem32);
break;
case ACPI_RDESC_TYPE_EXTENDED_ADDRESS_SPACE:
/*
* 64-Bit Address Resource
*/
buffer = byte_stream_buffer;
++buffer;
ACPI_MOVE_16_TO_16 (&temp16, buffer);
bytes_consumed = temp16 + 3;
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address64);
break;
case ACPI_RDESC_TYPE_QWORD_ADDRESS_SPACE:
/*
* 64-Bit Address Resource
*/
buffer = byte_stream_buffer;
++buffer;
ACPI_MOVE_16_TO_16 (&temp16, buffer);
bytes_consumed = temp16 + 3;
/*
* Resource Source Index and Resource Source are optional elements.
* Check the length of the Bytestream. If it is greater than 43,
* that means that an Index exists and is followed by a null
* terminated string. Therefore, set the temp variable to the
* length minus the minimum byte stream length plus the byte for
* the Index to determine the size of the NULL terminated string.
*/
if (43 < temp16) {
temp8 = (u8) (temp16 - 44);
}
else {
temp8 = 0;
}
/* Ensure a 64-bit boundary for the structure */
temp8 = (u8) ACPI_ROUND_UP_to_64_bITS (temp8);
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address64) +
(temp8 * sizeof (u8));
break;
case ACPI_RDESC_TYPE_DWORD_ADDRESS_SPACE:
/*
* 32-Bit Address Resource
*/
buffer = byte_stream_buffer;
++buffer;
ACPI_MOVE_16_TO_16 (&temp16, buffer);
bytes_consumed = temp16 + 3;
/*
* Resource Source Index and Resource Source are optional elements.
* Check the length of the Bytestream. If it is greater than 23,
* that means that an Index exists and is followed by a null
* terminated string. Therefore, set the temp variable to the
* length minus the minimum byte stream length plus the byte for
* the Index to determine the size of the NULL terminated string.
*/
if (23 < temp16) {
temp8 = (u8) (temp16 - 24);
}
else {
temp8 = 0;
}
/* Ensure a 32-bit boundary for the structure */
temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address32) +
(temp8 * sizeof (u8));
break;
case ACPI_RDESC_TYPE_WORD_ADDRESS_SPACE:
/*
* 16-Bit Address Resource
*/
buffer = byte_stream_buffer;
++buffer;
ACPI_MOVE_16_TO_16 (&temp16, buffer);
bytes_consumed = temp16 + 3;
/*
* Resource Source Index and Resource Source are optional elements.
* Check the length of the Bytestream. If it is greater than 13,
* that means that an Index exists and is followed by a null
* terminated string. Therefore, set the temp variable to the
* length minus the minimum byte stream length plus the byte for
* the Index to determine the size of the NULL terminated string.
*/
if (13 < temp16) {
temp8 = (u8) (temp16 - 14);
}
else {
temp8 = 0;
}
/* Ensure a 32-bit boundary for the structure */
temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_address16) +
(temp8 * sizeof (u8));
break;
case ACPI_RDESC_TYPE_EXTENDED_XRUPT:
/*
* Extended IRQ
*/
buffer = byte_stream_buffer;
++buffer;
ACPI_MOVE_16_TO_16 (&temp16, buffer);
bytes_consumed = temp16 + 3;
/*
* Point past the length field and the Interrupt vector flags to
* save off the Interrupt table length to the Temp8 variable.
*/
buffer += 3;
temp8 = *buffer;
/*
* To compensate for multiple interrupt numbers, add 4 bytes for
* each additional interrupts greater than 1
*/
additional_bytes = (u8) ((temp8 - 1) * 4);
/*
* Resource Source Index and Resource Source are optional elements.
* Check the length of the Bytestream. If it is greater than 9,
* that means that an Index exists and is followed by a null
* terminated string. Therefore, set the temp variable to the
* length minus the minimum byte stream length plus the byte for
* the Index to determine the size of the NULL terminated string.
*/
if (9 + additional_bytes < temp16) {
temp8 = (u8) (temp16 - (9 + additional_bytes));
}
else {
temp8 = 0;
}
/* Ensure a 32-bit boundary for the structure */
temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_ext_irq) +
(additional_bytes * sizeof (u8)) +
(temp8 * sizeof (u8));
break;
case ACPI_RDESC_TYPE_IRQ_FORMAT:
/*
* IRQ Resource.
* Determine if it there are two or three trailing bytes
*/
buffer = byte_stream_buffer;
temp8 = *buffer;
if(temp8 & 0x01) {
bytes_consumed = 4;
}
else {
bytes_consumed = 3;
}
/* Point past the descriptor */
++buffer;
/* Look at the number of bits set */
ACPI_MOVE_16_TO_16 (&temp16, buffer);
for (index = 0; index < 16; index++) {
if (temp16 & 0x1) {
++number_of_interrupts;
}
temp16 >>= 1;
}
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_io) +
(number_of_interrupts * sizeof (u32));
break;
case ACPI_RDESC_TYPE_DMA_FORMAT:
/*
* DMA Resource
*/
buffer = byte_stream_buffer;
bytes_consumed = 3;
/* Point past the descriptor */
++buffer;
/* Look at the number of bits set */
temp8 = *buffer;
for(index = 0; index < 8; index++) {
if(temp8 & 0x1) {
++number_of_channels;
}
temp8 >>= 1;
}
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_dma) +
(number_of_channels * sizeof (u32));
break;
case ACPI_RDESC_TYPE_START_DEPENDENT:
/*
* Start Dependent Functions Resource
* Determine if it there are two or three trailing bytes
*/
buffer = byte_stream_buffer;
temp8 = *buffer;
if(temp8 & 0x01) {
bytes_consumed = 2;
}
else {
bytes_consumed = 1;
}
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_start_dpf);
break;
case ACPI_RDESC_TYPE_END_DEPENDENT:
/*
* End Dependent Functions Resource
*/
bytes_consumed = 1;
structure_size = ACPI_RESOURCE_LENGTH;
break;
case ACPI_RDESC_TYPE_IO_PORT:
/*
* IO Port Resource
*/
bytes_consumed = 8;
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_io);
break;
case ACPI_RDESC_TYPE_FIXED_IO_PORT:
/*
* Fixed IO Port Resource
*/
bytes_consumed = 4;
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_fixed_io);
break;
case ACPI_RDESC_TYPE_SMALL_VENDOR:
/*
* Vendor Specific Resource
*/
buffer = byte_stream_buffer;
temp8 = *buffer;
temp8 = (u8) (temp8 & 0x7);
bytes_consumed = temp8 + 1;
/* Ensure a 32-bit boundary for the structure */
temp8 = (u8) ACPI_ROUND_UP_to_32_bITS (temp8);
structure_size = ACPI_SIZEOF_RESOURCE (struct acpi_resource_vendor) +
(temp8 * sizeof (u8));
break;
case ACPI_RDESC_TYPE_END_TAG:
/*
* End Tag
*/
bytes_consumed = 2;
structure_size = ACPI_RESOURCE_LENGTH;
byte_stream_buffer_length = bytes_parsed;
break;
default:
/*
* If we get here, everything is out of sync,
* exit with an error
*/
return_ACPI_STATUS (AE_AML_INVALID_RESOURCE_TYPE);
}
/* Update the return value and counter */
buffer_size += (u32) ACPI_ALIGN_RESOURCE_SIZE (structure_size);
bytes_parsed += bytes_consumed;
/* Set the byte stream to point to the next resource */
byte_stream_buffer += bytes_consumed;
}
/* This is the data the caller needs */
*size_needed = buffer_size;
return_ACPI_STATUS (AE_OK);
}
*/ resource_source->string_ptr = ACPI_ADD_PTR(char, resource_source, sizeof(struct acpi_resource_source)); } /* * In order for the struct_size to fall on a 32-bit boundary, calculate * the length of the string (+1 for the NULL terminator) and expand the * struct_size to the next 32-bit boundary. * * Zero the entire area of the buffer. */ total_length = ACPI_ROUND_UP_to_32_bITS(ACPI_STRLEN ((char *)&aml_resource_source[1]) + 1); ACPI_MEMSET(resource_source->string_ptr, 0, total_length); /* Copy the resource_source string to the destination */ resource_source->string_length = acpi_rs_strcpy(resource_source->string_ptr, (char *)&aml_resource_source[1]); return ((acpi_rs_length) total_length); } /* resource_source is not present */ resource_source->index = 0;
